I am a
newcomer in your forum not being an computer expert but only an author and
photographer. I have planned to publish
illustrated E-books in PDF format and sell them through my web site on-line.
The resolution of the images in my books is high which understandably also
increases the file size and probably also causes problems when the customers
are downloading them. Thus, my aim is to
control the PDF file size accurately but this seems to be very difficult.

For
example Adobe acrobat V.9 – which I
have- allows me to reduce file size but this is happening automatically so that
this software tries to reduce the file size as much as possible for example in
the following way:

202434 Kt
-> 9431 Kt

37870 Kt -> 7861 Kt

I have also
PDF architect and this program unfortunately doesn’t ‘ have “the reduce file size” option
at all.

Most free
similar computer programs always squeeze PDF-file size less than 10 MB and some
of them don’t accept files bigger than 5 MB. “Secure cloud” has no limitations
as far as PDF file size is concerned but the result is out of control and
normally < 10 MB which is optimal file size only for email attachments.

Microsoft
word converts even large PDF files with images to word format easily and the
result looks perfect and similar than
the original PDF file but Word doesn’t allow the reduction of file size so that after this reduction I could
convert this new word file back to PDF format ???

The optimal
situation would probably be - when transmitting data through The Internet- have
a large file , pack/squeeze that for downloading/transmission so that the
customer when finally receiving the E-book could again open the file and get
the product in its original format ( large file, printable E-book and images with good
resolution).

My question is ( after trying to reduce my PDF
file size (202434 Kt) 50%
today several hours using different methods without result ):

Is there anybody on
Planet PDF forum who could tell me (1) how to control the PDF file reduction
process step by step so that the result (file size) is for example 50 % from the source file size – without
purchasing for example some expensive Adobe products or layout softwares. (2)
Is it possible to “pack” PDF files for downloading in a way for example using a
method I decribed above ?

I think you need to realise there is no way to shrink it down for transmission so the customer can get it back. PDF uses state of the art compression already; it's as small as it can be without losing quality. So if you shrink, that quality is gone.

No compression tools I heard of let you choose a target size. You choose what to sacrifice and it is removed; the remainder is how big the result is.

But you shouldn't have to shrink after the event if you use appropriate settings when you first make the PDF. Get to know the PDF creation settings in Acrobat, and their effect on file size.

Have you looked at options such as the functionality offered by Luratech systems? Though it's a while since, I remember there was some level of fine tuning between size and quality. The problem hinges not only on image size but image type. A browse of options for implementing MRC (Mixed Raster Content) solutions may be helpful but it is, unfortunately, a large subject. If nothing else, it may give you an understanding of the scale of your problem.

With the Professional version of Acrobat one has the Optimization tool that can modify various compression factors and techniques, remove some items, and perform an audit of space used by various objects.

Since the content of a PDF can be very complex, it is not possible to come up with one optimization policy.

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